Motorola MPC823e Reference Manual page 699

E
STATUS 0
LENGTH
POINTER 32-BIT BUFFER POINTER
E
0
STATUS
LENGTH
POINTER
32-BIT BUFFER POINTER
E
0
STATUS
LENGTH
POINTER 32-BIT BUFFER POINTER
E
1
STATUS
LENGTH
32-BIT BUFFER POINTER
POINTER
STORED IN RX BUFFER
F A A C
TWO FRAMES
RECEIVED IN HDLC
TIME
LEGEND:
F = FLAG
A = ADDRESS BYTE
C = CONTROL BYTE
I = INFORMATION BYTE
CR = CRC BYTE
Figure 16-80. SCC2 HDLC Receive Buffer Descriptor Example
MOTOROLA
RECEIVE BD 0
L F
0 1
0008
RECEIVE BD 1
L F
1 0
000B
RECEIVE BD 2
L
F AB
1 1 1
0003
RECEIVE BD 3
XXXX
I I I I I I CR CR F
MPC823e REFERENCE MANUAL
Communication Processor Module
MRBLR = 8 BYTES FOR SCC2
BUFFER
ADDRESS 1
ADDRESS 2
CONTROL BYTE
BUFFER
5
FULL
INFORMATION
(I-FIELD) BYTES
BUFFER
LAST I-FIELD BYTE
CRC BYTE 1
CRC BYTE 2
BUFFER
CLOSED WHEN
EMPTY
CLOSING FLAG
RECEIVED
BUFFER
ADDRESS 1
ADDRESS 2
CONTROL BYTE
ABORT WAS
RECEIVED
EMPTY
AFTER CONTROL
BYTE
BUFFER
EMPTY
BUFFER
STILL
EMPTY
STORED IN RX BUFFER
LINE IDLE F A A C
UNEXPECTED ABORT
OCCURS BEFORE
CLOSING FLAG
8 BYTES
8 BYTES
8 BYTES
8 BYTES
ABORT/IDLE
PRESENT
TIME
16-245